Bench back support



FIG. 1 is a perspective view of a bench back support, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view; and,

FIG. 8 is a perspective view of the bench back support, showing our new design, in the operational condition. 

The ornamental design for bench back support, as shown and described. 